111407909 has 2 divisors, whose sum is σ = 111407910. Its totient is φ = 111407908.

The previous prime is 111407903. The next prime is 111407911. The reversal of 111407909 is 909704111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76562500 + 34845409 = 8750^2 + 5903^2 .

It is an emirp because it is prime and its reverse (909704111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111407909 - 2¹⁶ = 111342373 is a prime.

Together with 111407911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111407903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55703954 + 55703955.

It is an arithmetic number, because the mean of its divisors is an integer number (55703955).

Almost surely, 2^111407909 is an apocalyptic number.

It is an amenable number.

111407909 is a deficient number, since it is larger than the sum of its proper divisors (1).

111407909 is an equidigital number, since it uses as much as digits as its factorization.

111407909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 111407909 is about 10554.9945049725. The cubic root of 111407909 is about 481.1775328225.

The spelling of 111407909 in words is "one hundred eleven million, four hundred seven thousand, nine hundred nine".